/*
 * Copyright (c) 2010-2011, okazoh_tk. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  - Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *  - Neither the name of the copyright holder nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef ALKES_TREE_COMPOSITE_H_INCLUDED_
#define ALKES_TREE_COMPOSITE_H_INCLUDED_

#include "alkes/tree/Element.h"
#include "alkes/core/Deque.h"

namespace alkes {

typedef Deque ElementContainer;

class Layer;

class AL_TREE_EXPORT Composite
    : public Element
{
    AL_DECLARE_ELEMENT(Composite, Element);

public:
    Composite();

    typedef ElementContainer::Iterator Iterator;

    virtual bool hasVisibleChild() const = 0;

protected:

    friend class Layer;

    bool preRender(GraphicsContext& gc, Iterator& reverse_iter);
    void postRender(GraphicsContext& gc, bool rendered_child);

    bool preUpdate(UpdateContext& uc, Iterator& reverse_iter);
    bool postUpdate(UpdateContext& uc, bool updated_child);

    virtual bool onPreRender(GraphicsContext& gc, Iterator& reverse_iter) = 0;
    virtual void onPostRender(GraphicsContext& gc, bool rendered_child) = 0;

    virtual bool onPreUpdate(UpdateContext& uc, Iterator& reverse_iter) = 0;
    virtual bool onPostUpdate(UpdateContext& uc, bool updated_child) = 0;
};

}

#endif
